/*
 * Copyright 2021, Offchain Labs, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef data_storage_readsnapshottransaction_hpp
#define data_storage_readsnapshottransaction_hpp

#include <data_storage/readtransaction.hpp>

class ReadSnapshotTransaction : public ReadConsistentTransaction {
   public:
    ReadSnapshotTransaction() = delete;
    explicit ReadSnapshotTransaction(std::shared_ptr<DataStorage> store)
        : ReadConsistentTransaction(std::move(store)) {
        // Make sure database isn't closed while it is being used
        auto counter = transaction->datastorage->tryLockShared();

        read_options.snapshot = transaction->datastorage->txn_db->GetSnapshot();
    }
    ~ReadSnapshotTransaction() {
        // Make sure database isn't closed while it is being used
        auto counter = transaction->datastorage->tryLockShared();

        transaction->datastorage->txn_db->ReleaseSnapshot(
            read_options.snapshot);
    }
};

#endif  // data_storage_readsnapshottransaction_hpp
